Add Phone Number to Header

Hi,

I'm trying to add a phone number to the heading of a website I'm redesigning for a client. When I add the phone number, it creates a FaceTime call instead of a phone call. I'm fairly new to Squarespace, so I'd appreciate any help, advice, or clarification. Thanks! 

The OS decides which app will handle the phone number when clicked on a website.

The website has no control over what happens when the number is clicked.